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Old 10-21-2003, 01:27 PM
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1988 300e diagnostics

I am going to try and do the onboard test tonight with my multimeter. DO I just stick the postive lead in the #3 hole on the lamda control and ground the black? With the multimeter set to duty cycle I just turn the key to one but not start the car? Is that about right or am I way here? ALso am I looking for 30% or 50%

I read the walk through in the DIY section just wanted to make sure.


1988 300e
130,000 miles
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